JP2556660Y2 - Screw extruder - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw extruder for extruding a material to be extruded, such as rubber, supplied from a kneading machine toward a pelletizer or the like, and particularly to a material to be extruded regardless of the material to be extruded. To a screw portion of a screw that can be reliably engaged.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional screw extruder of this type.

In FIG. 4, a hopper opening 12 is provided at an upper end of a hopper cylinder 11 of the screw extruder. A hopper chute 13 is provided above the hopper opening 12, and a material to be extruded 14 such as rubber or plastic kneaded by a batch-type kneader (not shown) disposed above the hopper chute 13 through the hopper opening 12. 11. A screw 15 is rotatably mounted in the hopper cylinder 11, and a pusher device 16 for pushing the material to be extruded 14 toward the screw 15 is provided on a side portion of the hopper cylinder 11. The pusher device 16 has a pusher ram 18 fitted in a cylinder casing 17, and the pusher ram 18 is a piston rod 1 of a drive cylinder 19.
9a via a bracket 20. Then, by extending and contracting the piston rod 19a, the pusher ram 18
It can move forward and backward toward a.

Next, the operation of the screw extruder having such a configuration will be described. The material to be extruded 14 kneaded by a batch kneader or the like is supplied as a lump into the hopper cylinder 11 from the hopper opening 12 through the hopper chute 13. The pusher ram 18 of the pusher device 16 advances toward the screw portion 15 a of the screw 15.
The retreating is repeated, and a space A having a variable size is formed between the distal end 18a of the pusher ram 18 and the screw portion 15a of the screw 15. The material to be extruded 14 supplied into the hopper cylinder 11 is deformed by its own weight and enters the space A. When the pusher ram 18 advances toward the screw portion 15a of the screw 15, the space A
The material to be extruded 14 has entered the screw portion 1 of the screw 15.
It is pushed toward 5a. The screw 15 is rotating in the direction of arrow R in the hopper cylinder 11, and the material to be extruded 14 bites into the screw portion 15 a of the screw 15 and is carried forward. And the hopper cylinder 11
Is fed to a not shown pelletizer or the like provided at the outlet portion, and is extruded into a pellet shape or the like.

[0005]

In the screw extruder described in the prior art, the material to be extruded 14 supplied into the hopper cylinder 11 is deformed by its own weight and is pushed.
Of the screw 15 into the space A formed between the tip 18a of the screw 15 and the screw portion 15a of the screw 15, and is pushed toward the screw portion 15a of the screw 15 by the pusher ram 18. However, in recent years, extremely hard materials, which are intermediates between plastic and rubber, have been processed by this screw extruder. When the material to be extruded is hard as described above, deformation due to its own weight is small, and therefore, as shown in FIG.
May be in a bridge state between the point B and the point C of the cylinder casing 17 and may not enter the space A. At that time, the pusher device 16 does not function effectively, and the material to be extruded 14 There is a problem that the screw portion 15a cannot be bitten.

The present invention has been made in view of the above-mentioned problems of the prior art, and it is an object of the present invention to reliably extrude a material to be extruded regardless of the material to be extruded. An object of the present invention is to provide a screw extruder that can be engaged with a screw portion.

[0007]

In order to solve the above-mentioned object, a screw extruder according to the present invention comprises a hopper cylinder having a hopper opening, rubber and the like which are installed above the hopper opening and kneaded by a kneader. A hopper chute for supplying the material to be extruded from the hopper opening into the hopper cylinder,
A screw rotatably mounted in the hopper cylinder,
In a screw extruder provided with a pusher device provided at a side portion of a hopper cylinder and for pushing a material to be extruded toward a screw, a base is supported on a lower portion of the hopper chute by the hopper chute. A swingable damper that pushes the extruded material down toward the screw is provided.

[0008]

The material to be extruded is formed between the tip of the pusher ram and the screw portion of the screw regardless of the material to be extruded because the damper pushes down the material to be extruded in the hopper cylinder toward the screw in the lowered state. Into the space
It is pushed toward the thread of the screw by the pusher ram.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of the screw extruder of the present invention, and FIG. 2 is a sectional view taken along line XX of FIG. In FIGS. 1 and 2, portions having the same functions as those in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 1 and FIG. 2, a damper 2 having a base 2a supported at a lower portion of the hopper chute 1 is provided on a hopper chute 1 of the screw extruder. The damper 2 is swingable by a rotary actuator 3, and in a lowered state, pushes the extruded material 14 in the hopper cylinder 11 toward the screw 15 with a predetermined pressing force until reaching the lower end position.
Further, when the material to be extruded 14 is supplied into the hopper cylinder 11 from a batch-type kneader or the like disposed above, the damper 2 retreats to the upper end position in the storage portion 1 a provided on the side of the hopper chute 1, It does not hinder supply. In addition, a detection device such as a limit switch (not shown) is installed at an appropriate position of the damper 2, and a swing command of the damper 2 is automatically controlled by issuing an operation command of the rotary actuator 3 from the detection device. Has become.

Next, the operation of the screw extruder having the above-described structure will be described. With the damper 2 retracted to the upper end position in the storage portion 1 a of the hopper chute 1, the material to be extruded 14 in a lump is supplied from the hopper opening 12 into the hopper cylinder 11. Then, the damper 2 is lowered by the rotary actuator 3, and the material to be extruded 14 in the hopper cylinder 11 is pushed down toward the screw 15 with a predetermined pressing force. As a result, even if the material to be extruded 14 is hard, the tip 18a of the pusher ram 18 and the threaded portion 15a of the screw 15 are formed.
And enters the space A formed between them. When the pusher ram 18 advances toward the screw portion 15a of the screw 15, the material to be extruded 1
4 is pushed toward the screw portion 15a of the screw 15 and bites into the screw portion 15a of the screw 15. In this way, when the material to be extruded 14 gradually bites into the screw portion 15a of the screw 15 and is conveyed forward, and when the damper 2 reaches the lower end position, the detecting device detects this and activates the rotary actuator 3. Issue a command to switch from descending to ascending. As a result, the damper 2 moves up to the upper end position, and waits for the next material supply at this position. As described above, the damper pushes the material to be extruded in the hopper cylinder toward the screw so that the material to be extruded can be reliably bitten into the screw portion of the screw regardless of the material to be extruded. Therefore, this screw extruder can be applied to various polymer materials.

In the above embodiment, the case where the swinging direction of the damper is the direction toward the space A has been described.
As shown in FIG. 3, the swinging direction of the damper can be set to the pushing direction (the direction toward the front of the paper), and in this case, the same effect as that of the above embodiment can be obtained.

[0013]

[Effects of the Invention] The present invention has the following effects because it is configured as described above. Since the damper pushes down the material to be extruded in the hopper cylinder toward the screw in the lowered state, even if the material to be extruded is hard, the material to be extruded is located between the tip of the pusher ram and the screw portion of the screw. It penetrates the space formed and is pushed toward the thread of the screw by the pusher ram. Thereby, regardless of the material to be extruded, the material to be extruded can be reliably bitten into the screw portion of the screw, and this screw extruder can be applied to various polymer materials. Become.

[Brief description of the drawings]

FIG. 1 is a sectional view of the screw extruder of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a sectional view showing another damper.

FIG. 4 is a sectional view of a conventional screw extruder.

[Explanation of symbols]

 Reference Signs List 1 hopper chute 2 damper 2a base of damper 11 hopper cylinder 12 hopper opening 14 material to be extruded 15 screw 16 pusher device 17 pusher ram

Claims (1)

(57) [Scope of request for utility model registration] 1. A hopper cylinder having a hopper opening, a hopper chute provided at an upper part of the hopper opening and supplying a material to be extruded such as rubber kneaded by a kneading machine into the hopper cylinder from the hopper opening. In a screw extruder provided with a screw rotatably mounted in a cylinder and a pusher device provided on a side portion of a hopper cylinder and for pushing a material to be extruded toward the screw, the hopper chute has a hopper base. A screw extruder provided with a swingable damper supported at a lower portion of a chute and for pushing down a material to be extruded in a hopper cylinder toward a screw in a lowered state.